20389900

素因数分解:

$2^2\times 5^2\times {\mathrm{29}}^1\times {\mathrm{79}}^1\times {\mathrm{89}}^1$

素因数の和:211

約数の個数: 72

約数和(自身を含む): 46872000

約数和(自身を除く): 26482100

約数列:

[1, 2, 4, 5, 10, 20, 25, 29, 50, 58, 79, 89, 100, 116, 145, 158, 178, 290, 316, 356, 395, 445, 580, 725, 790, 890, 1450, 1580, 1780, 1975, 2225, 2291, 2581, 2900, 3950, 4450, 4582, 5162, 7031, 7900, 8900, 9164, 10324, 11455, 12905, 14062, 22910, 25810, 28124, 35155, 45820, 51620, 57275, 64525, 70310, 114550, 129050, 140620, 175775, 203899, 229100, 258100, 351550, 407798, 703100, 815596, 1019495, 2038990, 4077980, 5097475, 10194950, 20389900]

約数ペア:

[(1, 20389900), (2, 10194950), (4, 5097475), (5, 4077980), (10, 2038990), (20, 1019495), (25, 815596), (29, 703100), (50, 407798), (58, 351550), (79, 258100), (89, 229100), (100, 203899), (116, 175775), (145, 140620), (158, 129050), (178, 114550), (290, 70310), (316, 64525), (356, 57275), (395, 51620), (445, 45820), (580, 35155), (725, 28124), (790, 25810), (890, 22910), (1450, 14062), (1580, 12905), (1780, 11455), (1975, 10324), (2225, 9164), (2291, 8900), (2581, 7900), (2900, 7031), (3950, 5162), (4450, 4582)]